RangeSlider

An extension of the Flutter Material Slider to allow selection of a range of values via 2 thumbs.

Step by step explanation

A full explanation on how to build such Widget may be found on my blog:

You should ensure that you add the following dependency in your Flutter project.

dependencies:
 flutter_range_slider: "^1.0.1"

You should then run flutter packages upgrade or update your packages in IntelliJ.

In your Dart code, to use it:

import 'package:flutter_range_slider/flutter_range_slider.dart';

An example can be found in the example folder. Check it out.